Stability of incompressible formulations enriched with X-FEM

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An embedded Dirichlet formulation for 3D continua (2010, unknown): “For additional information on applying the XFEM to incompressible materials, see also [26].”
An extended finite element method for fluid flow in partially saturated porous media with weak discontinuities; the convergence analysis of local enrichment strategies (2013, methodology): “The XFEM was also implemented in nonlinear problems including the plastic fracture mechanics [18], the frictional contact [19], the large plastic deformation of arbitrary interfaces [20,21], and the localization phenomenon in higher-order Cosserat theory [22] and in the treatment of incompressible o”
Strain smoothing in FEM and XFEM (2010, background): “In particular, the suppression of volumetric locking for incompressible materials [31,50].”
Extended finite element method in computational fracture mechanics: a retrospective examination (2015, unknown): “We point the reader to the work of Legrain et al. (2008) for an exposé on this topic.”